1 /*
   2  * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_JFR_WRITERS_JFRSTREAMWRITERHOST_HPP
  26 #define SHARE_VM_JFR_WRITERS_JFRSTREAMWRITERHOST_HPP
  27 
  28 #include "jfr/utilities/jfrTypes.hpp"
  29 #include "jfr/writers/jfrMemoryWriterHost.inline.hpp"
  30 
  31 template <typename Adapter, typename AP> // Adapter and AllocationPolicy
  32 class StreamWriterHost : public MemoryWriterHost<Adapter, AP> {
  33  public:
  34   typedef typename Adapter::StorageType StorageType;
  35  private:
  36   intptr_t _stream_pos;
  37   fio_fd _fd;
  38   intptr_t current_stream_position() const;
  39 
  40  protected:
  41   StreamWriterHost(StorageType* storage, Thread* thread);
  42   StreamWriterHost(StorageType* storage, size_t size);
  43   StreamWriterHost(Thread* thread);
  44   bool accommodate(size_t used, size_t requested);
  45   void bytes(void* dest, const void* src, size_t len);
  46   void flush(size_t size);
  47   bool has_valid_fd() const;
  48 
  49  public:
  50   intptr_t current_offset() const;
  51   void seek(intptr_t offset);
  52   void flush();
  53   void write_unbuffered(const void* src, size_t len);
  54   bool is_valid() const;
  55   void close_fd();
  56   void reset(fio_fd fd);
  57 };
  58 
  59 #endif // SHARE_VM_JFR_WRITERS_JFRSTREAMWRITERHOST_HPP
  60